updated readme

Author: ShrinathGupta

README.md

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+# React-native-windows-demo
+The intention of this repository is to show basic UWP application by using ***React Native Windows vnext***.
+https://github.com/microsoft/react-native-windows/tree/master/vnext [ _Involves closer interaction between C++ and JS_ ]
+
+***The development of the React Native Windows vnext implementation is ongoing.***
+
+### Prerequisites
+* Js editor (VS code editor)<br>
+* VS 2017 or greater
+* React Native Windows -vnext currently supports Windows 10 SDK >= 15063
+* Install node
+* Enable your machine for development [ [DeveloperMode_Settings_Reference](https://docs.microsoft.com/en-us/windows/uwp/get-started/enable-your-device-for-development)].
+
+
+### Getting started
+* npm `install -g react-native-cli`
+* clone respository
+* cd `uwp_vnext_demo/`
+* `npm install`
+
+### Run Project
+*  Open `windows/uwp_vnext_demo.sln` in VS 2019. //_This might ask you to install few dependencies_
+*  Select 'debug'  and `x64`from the configuration selection available next to Run.
+*  Right click on solution and `Build solution`.(_This may take few minutes_)
+*  Right click on solution and deploy it.
+*  Go to project directory and open gitbash.
+*  cd `uwp_vnext_demo`.
+*  Run command 'react-native start'. //_This will start local client server on port 8081 to create JS bundle_
+*  Go to search bar and type `uwp_vnext_demo`.
+*  Launch the application.
+
+### Application covers following 
+    * Buttons
+    * Grid View by using FlatList
+    * Image 
+    * Text
+    * Input
+    * ScrollView
+    * FlatList
+    * Linking module of react-native